Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos anos Pia Pajunen e Nina Sundberg venceram o duplo feminino?
 ###Tabelas: CREATE TABLE centuries_in_the_friends_life_t20 (centuries_in_the_friends_life_t20_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Team VARCHAR, Runs VARCHAR, Balls INT, Year INT, Against VARCHAR) CREATE TABLE data (data_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Year INT, Landfall VARCHAR, NHC Advisory Number VARCHAR, V(mph) INT, R(miles) INT, Saffir-Simpson Category INT, CHI VARCHAR) CREATE TABLE south_asian (south_asian_id AUTO_INCREMENT PRIMARY KEY, Letters VARCHAR, Organization VARCHAR, Nickname VARCHAR, Founding Date VARCHAR, Founding University VARCHAR, Type VARCHAR) CREATE TABLE dzrh_nationwide (dzrh_nationwide_id AUTO_INCREMENT PRIMARY KEY, Branding VARCHAR, Callsign VARCHAR, Frequency VARCHAR, Power (kW) VARCHAR, Station Type VARCHAR, Location VARCHAR) CREATE TABLE past_winners (past_winners_id AUTO_INCREMENT PRIMARY KEY, Year INT, Men's singles VARCHAR, Women's singles VARCHAR, Men's doubles VARCHAR, Women's doubles VARCHAR, Mixed doubles VARCHAR)  
SELECT COUNT Year FROM past_winners WHERE Women's doubles = pia pajunen nina sundberg